25=3(2a+15)-a

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Solution for 25=3(2a+15)-a equation: 



25=3(2a+15)-a

We move all terms to the left:

25-(3(2a+15)-a)=0



We calculate terms in parentheses: -(3(2a+15)-a), so:

3(2a+15)-a

We add all the numbers together, and all the variables

-1a+3(2a+15)

We multiply parentheses

-1a+6a+45

We add all the numbers together, and all the variables

5a+45

Back to the equation:

-(5a+45)



We get rid of parentheses

-5a-45+25=0

We add all the numbers together, and all the variables

-5a-20=0

We move all terms containing a to the left, all other terms to the right

-5a=20

a=20/-5

a=-4

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